Disk arrays are used to improve performance and reliability. The amount of improvement depends on the application programs that you run on the server and the RAID levels that you assign to the logical drive.
Each RAID level provides different levels of fault-tolerance (data redundancy), utilization of physical drive capacity, and read and write performance. In addition, the RAID levels differ in regard to the minimum and maximum number of physical drives that are supported.
When selecting a RAID level for your system, consider the following factors.
| RAID level | Data redundancy | Physical drive capacity utilization | Read performance | Write performance | Built-in spare drive | Min. number of drives | Max. number of drives |
|---|---|---|---|---|---|---|---|
| RAID level-0 | No | 100% | Superior | Superior | No | 1 | 16 |
| RAID level-1 | Yes | 50% | Very high | Very high | No | 2 | 2 |
| RAID level-1E | Yes | 50% | Very high | Very high | No | 3 | 16 |
| RAID level-5 | Yes | 67% to 94% | Superior | High | No | 3 | 16 |
| RAID level-5E | Yes | 50% to 88% | Superior | High | Yes | 4 | 16 |
| RAID level-5EE | Yes | 50% to 88% | Superior | High | Yes | 4 | 16 |
| RAID level-6 | Yes | 50% to 88% | Very High | High | No | 4 | 16 |
| RAID level-00 | No | 100% | Superior | Superior | No | 2 | 60 |
| RAID level-10 | Yes | 50% | Very high | Very high | No | 4 | 16 |
| RAID level-1E0 | Yes | 50% | Very high | Very high | No | 6 | 60 |
| RAID level-50 | Yes | 67% to 94% | Superior | High | No | 6 | 60 (SCSI) 128 (SAS, SATA) |
| RAID level-60 | Yes | 50% to 88% | Very High | High | No | 8 | 128 |
| Spanned Volume | No | 100% | Superior | Superior | No | 2 | 48 |
| RAID Volume | No | 50% to 100% | Superior | Superior | No | 4 | 48 |
Physical drive utilization, read performance, and write performance depend on the number of drives in the array. Generally, the more drives in the array, the better the performance.
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